JP5717090B2 - Power receiving unit, charging system including the power receiving unit, and electric device - Google Patents

Description

  The present invention relates to a power receiving unit having a power receiving coil and a battery, a charging system including the power receiving unit, and an electrical apparatus.

  2. Description of the Related Art Conventionally, a power receiving unit having a power receiving coil in which a current flows according to magnetic flux generated in a power feeding coil and a battery for charging the current is known. In such a power receiving unit, as disclosed in Patent Document 1, for example, power is received in a non-contact state with respect to the power feeding side, and the battery is charged. Specifically, in the above-described power receiving unit, a battery electrically connected to the power receiving coil is charged using so-called electromagnetic induction in which a current flows to the power receiving coil on the power receiving side by the magnetic flux generated in the power feeding coil. Is configured to do.

JP 2008-5607 A

  By the way, as described above, when charging the battery in the power receiving unit using electromagnetic induction, the power receiving coil and the power feeding coil are as close as possible so that the lines of magnetic force generated in the power feeding coil penetrate the power receiving coil in the power receiving unit. It is preferable to arrange.

  In a general power receiving unit, a magnetic shield is disposed with respect to a power receiving coil disposed in a casing, and a battery, a circuit component, or the like is disposed on the magnetic shield. Therefore, when charging the battery in the power receiving unit, it is necessary to pay attention to the posture of the power receiving unit so that the power receiving coil is positioned near the power feeding coil, and charging the battery is troublesome for the user. .

  Therefore, an object of the present invention is to obtain a configuration in which a battery can be efficiently charged in a power receiving unit having a power receiving coil and a battery without being influenced by the posture of the power receiving unit with respect to the power feeding coil.

  A power receiving unit according to an embodiment of the present invention includes a tubular power receiving coil in which a current flows due to a magnetic flux generated by energizing a power feeding coil, a battery charged by the current flowing in the power receiving coil, and the power receiving coil and the battery. A housing configured to be housed, and the power receiving coil is positioned in the housing so as to extend in one direction and have both ends positioned at a position where current flows by magnetic flux generated by the power feeding coil. Arranged (first configuration).

  With the above configuration, the power receiving coil is positioned in the casing of the power receiving unit in a position where both ends extend in one direction and the current flows by the magnetic flux generated by the power feeding coil. Even if it is close to the power feeding coil, a current can be passed through the power receiving coil. In other words, with the above-described configuration, the power receiving unit may be disposed so that either one of the both ends of the power receiving coil approaches the power feeding coil. Therefore, a configuration in which a magnetic shield or a circuit component is provided on one end side of the power receiving coil. In comparison, the degree of freedom of the posture of the power receiving unit with respect to the feeding coil is increased. Therefore, the battery of the power receiving unit can be easily contactlessly charged from the power feeding coil without paying much attention to the posture and direction of the power receiving unit as compared with the conventional configuration.

  The first configuration preferably further includes a magnetic body disposed inside the power receiving coil, and the magnetic body is preferably provided with a storage space for storing a battery therein ( Second configuration).

  By arranging the magnetic body inside the power receiving coil in this way, it is possible to penetrate more magnetic lines of force through the power receiving coil by the magnetic body, and the performance of the power receiving coil can be improved. In addition, by forming a storage space in the magnetic body, it is possible to realize a state in which almost no lines of magnetic force exist in the storage space while collecting magnetic lines of force in the magnetic body. It can prevent being affected by heat generation.

  Therefore, with the above-described configuration, while improving the performance of the power receiving coil, the battery can be arranged inside the power receiving coil to make the power receiving unit compact.

  In the second configuration, it is preferable that the magnetic body is formed in a tubular shape, and the storage space is a space surrounded by an inner peripheral surface of the magnetic body (third configuration). Thereby, since a battery can be easily arrange | positioned inside a tubular magnetic body, the power receiving unit of a compact structure can be obtained easily.

  In the second configuration, it is preferable that an internal space is formed in the magnetic body, and the storage space is configured by an internal space of the magnetic body (fourth configuration). By doing so, since many magnetic lines of force are collected by the magnetic body surrounding the internal space, there are fewer magnetic lines of force existing in the internal space. Therefore, if a battery is arranged in this internal space, the influence of magnetic flux can be further reduced. Therefore, with the above-described configuration, a power receiving unit having a compact configuration can be realized without being substantially affected by the magnetic flux.

  In any one of the first to fourth configurations, the power receiving coil is preferably a solenoid coil (fifth configuration). Thereby, the performance improvement of a receiving coil can be aimed at compared with a planar coil. In addition, since a columnar space is formed on the inner side of the power receiving coil, it is possible to arrange a magnetic body, a battery, and the like in the space. Therefore, with the above-described configuration, the performance of the power receiving coil can be improved and the power receiving unit can be made compact.

  The charging system according to an embodiment of the present invention includes a power reception unit having any one of the first to fifth configurations and a power supply unit having the power supply coil (sixth configuration).

  The electrical apparatus according to the embodiment of the present invention includes the power receiving unit having any one of the first to fifth configurations (seventh configuration).

  According to the power receiving unit according to the embodiment of the present invention, the power receiving coil is disposed in the housing so that both ends thereof are positioned so that the current flows by the magnetic flux of the power feeding coil. The battery can be easily charged without worrying too much about the orientation and orientation of the power receiving unit. Thereby, the convenience at the time of charging a battery can be aimed at.

FIG. 1 is a diagram illustrating a schematic configuration of a charging system according to the first embodiment. FIG. 2 is a circuit diagram showing a schematic configuration of the charging system. FIG. 3 is a cross-sectional view illustrating a schematic configuration of a power receiving coil in the power receiving unit of the charging system according to the second embodiment. FIG. 4 is a cross-sectional view illustrating a schematic configuration of a power receiving coil in the power receiving unit of the charging system according to the third embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The same or corresponding parts in the drawings are denoted by the same reference numerals and description thereof will not be repeated.

[Embodiment 1]
FIG. 1 is a diagram showing a schematic configuration of a charging system 1 according to Embodiment 1 of the present invention. The charging system 1 includes a charger 2 (power supply unit) and a power receiving unit 10 provided on the device 3 (electric device) side. The charging system 1 is used, for example, as a power supply system for a hearing aid, a keyless entry system for an automobile, a portable terminal such as a PDA (Personal Digital Assistant), or a small device (device 3) such as a camera.

  The charging system 1 is configured to transmit and receive power in a contactless manner between the charger 2 and the power receiving unit 10 on the device 3 side. That is, the charger 2 has a power feeding coil 21 that is electrically connected to a power source (not shown) via the AC adapter 5. On the other hand, the power receiving unit 10 includes a power receiving coil 12 that constitutes a part of a charging circuit 11 (see FIG. 2) that is electrically connected to the battery 4. That is, the charging system 1 is configured to supply power from the charger 2 to the power receiving unit 10 using electromagnetic induction. Here, non-contact power transmission / reception means power transmission / reception between two devices (units) without a terminal.

  As shown in FIG. 1, the charger 2 controls a feeding coil 21 that is electrically connected to a power source (not shown) and a current that flows through the feeding coil 21 in order to generate a predetermined magnetic field in the feeding coil 21. And a charging control circuit 22. A magnetic shield plate 23 is provided between the charging control circuit 22 and the feeding coil 21. The feeding coil 21, the charging control circuit 22 and the magnetic shield plate 23 are housed in the housing 20 of the charger 2. The housing 20 is formed in a box shape from a resin material.

  The feeding coil 21 is a solenoid coil formed in a cylindrical shape extending in the axial direction, for example. The power supply coil 21 is disposed in the housing 20 so that the axial direction of the power supply coil 21 coincides with the thickness direction of the housing 20 (vertical direction in FIG. 1).

  As shown in FIG. 2, the charging control circuit 22 includes a drive circuit 24 for supplying a high-frequency current to the power supply coil 21 and an oscillation circuit 25 for supplying an oscillation signal for causing the drive circuit 24 to output a high-frequency current. And. The drive circuit 24 is configured to pass an alternating current having a predetermined frequency through the power feeding coil 21 in accordance with an output signal from the oscillation circuit 25. Thereby, as shown by a broken line in FIG. 2, a magnetic force line extending in a direction orthogonal to the winding direction of the conducting wire is formed by the feeding coil 21. In the broken line shown in FIG. 2, the direction of the arrow is the direction of the lines of magnetic force. As described above, since a high-frequency alternating current flows through the power supply coil 21, the direction of the lines of magnetic force generated by the power supply coil 21 changes (inverts) according to the flow of the high-frequency alternating current.

  The configuration of the drive circuit 24 and the oscillation circuit 25 is the same as the configuration of each conventional circuit in non-contact charging, and thus detailed description thereof is omitted.

  As shown in FIG. 1, the power receiving unit 10 includes a circuit component 15 that constitutes a charging circuit 11 (see FIG. 2) that charges the battery 4 in addition to the battery 4 and the power receiving coil 12 described above. As shown in FIG. 1, a magnetic shield plate 16 is disposed between the power receiving coil 12, the battery 4, and the circuit component 15, similarly to the charger 2. Thereby, the battery 4 and the circuit component 15 can be protected from the magnetic flux generated in the power receiving coil 12. The battery 4, the power receiving coil 12, the circuit component 15, and the magnetic shield plate 16 are housed in a housing 17 of the device 3. In the present embodiment, the casing 17 constitutes the casing of the power receiving unit.

  Similarly to the power supply coil 21, the power reception coil 12 is a solenoid coil formed in a cylindrical shape extending in the axial direction, for example.

  The housing | casing 17 is formed in the box shape with the resin material similarly to the housing | casing 20 of the above-mentioned charger 2. FIG. Moreover, the housing | casing 17 is formed, for example in flat shape, and the receiving coil 12 and the battery 4 are arrange | positioned along with the horizontal direction inside. The power receiving coil 12 is arranged in the casing 17 so that the axial direction coincides with the thickness direction of the casing 17. In addition, the power receiving coil 12 is formed so that both end portions in the axial direction are located in the vicinity of the inner surface of the housing 17. That is, the power reception coil 12 is provided in the power reception unit 10 so that a current flows with respect to the magnetic field lines penetrating the top surface and bottom surface of the housing 17 in the thickness direction.

  In this embodiment, the power receiving unit 10 is housed in the housing 17 of the device 3. However, the present invention is not limited to this, and the power receiving unit 10 has another housing, and the power receiving unit 10 is in the housing. Each component of the unit 10 may be stored. In this case, the housing of the power receiving unit 10 is housed in the housing 17 of the device 3. The power receiving unit 10 may be configured to be removable from the device 3.

  As shown in FIG. 2, the charging circuit 11 including the circuit component 15 includes a power receiving coil 12, and a rectifying circuit 13 and a rectifying capacitor 14 for rectifying a current flowing through the power receiving coil 12. Yes. Although not particularly illustrated, the charging circuit 11 may be provided with a voltage adjusting unit or a charging control unit through which a current rectified by the rectifying circuit 13 and the rectifying capacitor 14 flows. For example, the voltage adjusting unit is configured to adjust the charging voltage for the battery 4 to a predetermined voltage. Further, the charge control unit is configured to control the voltage and current during charging according to the state of charge of the battery 4.

  The rectifier circuit 13 is a so-called bridge rectifier circuit composed of a bridge circuit constituted by four diodes 13a. The rectifier circuit 13 is connected to both ends of the power receiving coil 12 so that the current flowing through the power receiving coil 12 can be rectified. Specifically, the rectifier circuit 13 is configured by connecting two series circuits in which two diodes 13a are connected in series so that the forward directions of the diodes 13a are opposite to each other in parallel. . And the both ends of the receiving coil 12 are each connected to the connection part which connects two series circuits in parallel. On the other hand, between the diodes 13a of each series circuit and the two electrode plates of the rectifying capacitor 14 are electrically connected to each other. A battery 4 is connected to the rectifier circuit 13 in parallel with the rectifier capacitor 14.

  As described above, when the voltage adjustment unit and the charge control unit are provided in the power receiving unit 10, the voltage adjustment unit and the charge control unit are provided in parallel to the rectifying capacitor 14. The battery 4 is provided in parallel with the voltage adjustment unit and the charge control unit on the output side of the voltage adjustment unit and the charge control unit. Thereby, the voltage and current at the time of charging of the battery 4 can be controlled by the voltage adjusting unit and the charging control unit.

  With the configuration described above, in the power receiving unit 10, when a current flows through the power receiving coil 12 due to the magnetic flux generated in the power feeding coil 21 as will be described later, the current is rectified by the rectifier circuit 13 and the rectifying capacitor 14 and supplied to the battery 4. . Thereby, the battery 4 can be charged.

  As shown in FIG. 1, the power receiving unit 10 is disposed on the charger 2 such that the power receiving coil 12 is located above the power feeding coil 21 of the charger 2. That is, in the charger 2, the upper surface of the box-shaped housing 20 constitutes the placement surface of the power receiving unit 10. The power feeding coil 21 of the charger 2 is disposed in the vicinity of the placement surface.

  In addition, the power receiving coil 12 of the power receiving unit 10 is arranged in the casing 17 so that the axial direction coincides with the thickness direction of the casing 17 as described above. On the other hand, the feeding coil 21 of the charger 2 is also arranged in the housing 20 so that the axial direction coincides with the thickness direction of the housing 20 as described above. As a result, the axial direction of the power receiving coil 12 and the axial direction of the power feeding coil 21 can be matched in a state where the power receiving unit 10 is disposed on the mounting surface of the casing 20 of the charger 2. Therefore, when a magnetic flux is generated in the power supply coil 21, the magnetic field lines penetrate the power receiving coil 12 in the axial direction, and a current flows through the power receiving coil 12 by the magnetic flux at that time.

  That is, the power receiving coil 12 is disposed in the housing 17 so as to extend in one direction and have both ends positioned at positions where current flows due to the magnetic flux generated by the power feeding coil 21.

(Effect of Embodiment 1)
As described above, according to this embodiment, in the power receiving unit 10, the power receiving coil 12 is disposed so as to extend in the thickness direction of the housing 17, so that both ends of the power receiving coil 12 are connected to the upper surface and the lower surface of the housing 17. Can be positioned near. Moreover, since the axial direction of the power receiving coil 12 made of the solenoid coil and the axial direction of the power feeding coil 21 made of the solenoid coil of the charger 2 coincide with each other, a current is efficiently supplied to the power receiving coil 12 by the magnetic flux generated in the power feeding coil 21. It can flow. Therefore, even if either the upper surface or the lower surface of the housing 17 is placed on the mounting surface of the charger 2, the current can be generated in the power receiving coil 12. Therefore, when charging the battery 4 of the power receiving unit 10, it is not necessary to pay much attention to the posture of the power receiving unit, and the charging operation can be easily performed.

[Embodiment 2]
FIG. 3 shows a schematic configuration of the power receiving coil 31 in the power receiving unit of the charging system according to the second embodiment of the present invention. The configuration of this embodiment is that the hollow cylindrical magnetic body 33 is arranged inside the coil portion 32 constituting the power receiving coil 31, and the battery 4 is arranged inside the magnetic body 33. The configuration is different from that of the first embodiment. In the following description, only differences from the configuration of the first embodiment will be described, and the same parts as those of the first embodiment will be denoted by the same reference numerals and description thereof will be omitted.

  Specifically, as shown in FIG. 3, the power receiving coil 31 includes a coil part 32 constituted by a solenoid coil, and a cylindrical magnetic body 33 disposed in the coil part 32. The battery 4 is disposed inside the cylindrical magnetic body 33. That is, a storage space 34 for storing the battery 4 is formed inside the cylindrical magnetic body 33 by the inner peripheral surface of the magnetic body 33.

  The battery 4 may be fitted directly to the inner circumferential surface of the magnetic body 33, or may be fitted to the inner circumferential surface of the magnetic body 33 with the periphery of the battery 4 covered with a tape. Also good. Further, the battery 4 may be fixed in the magnetic body 33 by filling the inside of the magnetic body 33 with an insulating adhesive or the like in a state where the battery 4 is disposed inside the magnetic body 33.

  The magnetic body 33 may be any material as long as it has a higher relative permeability than stainless steel constituting the case of the battery 4. The magnetic body 33 is preferably made of a material having a high relative permeability, such as ferrite (relative permeability is about 1000) or permalloy (relative permeability is about 100,000).

  In addition to the battery 4, a circuit component 15 constituting the charging circuit 11 and the like may be disposed inside the magnetic body 33.

  Further, the inner surface of the magnetic body 33 may be formed in a tapered shape. That is, the magnetic body 33 may be formed in a tapered shape so that the inner diameter of one end of the magnetic body 33 is larger than that of the other end so that the battery 4 can be easily inserted therein. Furthermore, the inner surface of the magnetic body 33 may be formed in a step shape, or a protrusion for stopping the movement of the battery 4 may be formed on the inner surface.

  Further, the entire power receiving coil 31 may be covered with a tape member, a seal member, or the like in a state where the battery 4, the circuit component 15, etc. are housed in the magnetic body 33. In this case, a tape member, a seal member, or the like that covers the power receiving coil 31 constitutes a casing of the power receiving unit.

(Effect of Embodiment 2)
As described above, by arranging the magnetic body 33 in the coil portion 32 of the power receiving coil 31 as in the present embodiment, the performance of the power receiving coil 31 can be improved by the magnetic body 33.

  In addition, since the magnetic body 33 is formed in a cylindrical shape and the battery 4 is disposed inside the magnetic body 33, it is not necessary to secure a space for arranging the battery 4 separately from the power receiving coil 31. Can be made compact. In such a configuration, the magnetic lines of force penetrating the power receiving coil 31 gather in the magnetic body 33, so that there are almost no magnetic lines of force inside the magnetic body 33. Therefore, it is possible to prevent the influence of magnetic flux on the battery 4 disposed in the magnetic body 33.

  Therefore, according to the configuration of the present embodiment, the battery 4 can be made compact without being affected by the magnetic flux.

[Embodiment 3]
FIG. 4 shows a schematic configuration of the power receiving coil 41 in the power receiving unit of the charging system according to the third embodiment of the present invention. The configuration of this embodiment is different from that of the above-described embodiment 2 in that an internal space 43 is provided in the magnetic body 42 located inside the coil portion 32 and the battery 4 is disposed in the internal space 43. Different. In the following description, only differences from the configuration of the second embodiment will be described, and the same parts as those of the second embodiment will be denoted by the same reference numerals and description thereof will be omitted.

  Specifically, a columnar magnetic body 42 in which an internal space 43 is formed is disposed inside a coil portion 32 constituted by a solenoid coil. The internal space 43 of the magnetic body 42 is a closed space surrounded by a wall. In order to form such an internal space 43 that is a closed space, the columnar magnetic body 42 may be configured to be divided into a plurality (preferably two) in the axial direction, or a bottomed cylinder. The lid member may be attached to the shaped member.

  As in the second embodiment, the material constituting the magnetic body 42 may be any material as long as it has a higher relative permeability than stainless steel constituting the case of the battery 4. The magnetic body 42 is preferably made of a material having a large relative permeability such as ferrite (relative permeability is about 1000) or permalloy (relative permeability is about 100,000).

  A battery 4 is disposed in the internal space 43. As in the second embodiment, the battery 4 may be directly fitted to the inner peripheral surface of the magnetic body 42, or the battery 4 may be placed inside the magnetic body 42 with the periphery of the battery 4 covered with tape. It may be fitted. Further, the battery 4 may be fixed in the magnetic body 42 by filling the inside of the magnetic body 42 with an insulating adhesive or the like in a state where the battery 4 is disposed inside the magnetic body 42.

  Also in this embodiment, as in the second embodiment, in addition to the battery 4, the circuit component 15 constituting the charging circuit 11 and the like may be arranged inside the magnetic body 42.

  Further, in the present embodiment, the entire power receiving coil 41 may be covered with a tape member, a seal member, or the like in a state where the battery 4, the circuit component 15, or the like is stored in the magnetic body 42. In this case, a tape member, a seal member, or the like that covers the power receiving coil 41 constitutes a casing of the power receiving unit.

(Effect of Embodiment 3)
As described above, by arranging the magnetic body 42 in the coil portion 32 as in the present embodiment, the performance of the power receiving coil 41 can be improved by the magnetic body 42.

  In addition, by forming the internal space 43 as a closed space in the magnetic body 42 and disposing the battery 4 in the internal space 43, it is not necessary to secure a space for disposing the battery 4 separately from the power receiving coil 41. The power receiving unit can be made compact. In such a configuration, the magnetic lines of force penetrating the power receiving coil 41 are collected in the magnetic body 42. Therefore, compared to the configuration of the second embodiment, the magnetic lines of force existing in the internal space 43 surrounded by the magnetic material are Even less. Therefore, the influence of magnetic flux on the battery 4 disposed in the internal space 43 of the magnetic body 42 can be prevented more reliably.

  Therefore, according to the configuration of the present embodiment, the battery 4 can be made compact without being affected by the magnetic flux.

(Other embodiments)
While the embodiments of the present invention have been described above, the above-described embodiments are merely examples for carrying out the present invention. Therefore, the present invention is not limited to the above-described embodiment, and the above-described embodiment can be appropriately modified and implemented without departing from the spirit of the invention.

  In each of the above embodiments, the coil portions 32 and 42 constituting the power receiving coil 12, the power feeding coil 21, and the power receiving coils 31 and 41 are each formed in a cylindrical shape. However, the coil portions 32 and 42 constituting the power receiving coil 12, the power feeding coil 21, and the power receiving coils 31 and 41 may be other tubular shapes (tubular) such as a rectangular tube shape. Further, the magnetic bodies 33 and 42 in the power receiving coils 31 and 41 may have any shape as long as they can be disposed in the coil portions 32 and 42. Furthermore, the coil is not limited to a solenoid coil, and may be another type of coil.

  In each of the above-described embodiments, the power receiving coil 12 is disposed in the casing 17 so that the axial direction is the thickness direction of the casing 17. However, the power receiving coil may be arranged in the casing 17 so that the axial direction is the lateral direction of the casing 17. In this case, the power feeding coil 21 of the charger 2 may be disposed in the housing 20 so that the axial direction is the lateral direction of the housing 20.

  The power receiving unit according to the present invention can be used in a configuration having a power receiving coil in which a current flows by magnetic flux generated in the power feeding coil and a battery for charging the current flowing in the power receiving coil.

1: charging system, 2: charger (power supply unit), 3: device (electrical device), 4: battery, 10: power receiving unit, 11: charging circuit, 12, 31, 41: power receiving coil, 15: circuit component, 17, 20: Housing, 21: Feeding coil, 32: Coil portion, 33, 42: Magnetic body, 34: Storage space, 43: Internal space

Claims (7)

A tubular power receiving coil in which a current flows due to a magnetic flux generated by energizing a power feeding coil disposed in the vicinity of the mounting surface of the charger;
A battery charged by a current flowing in the power receiving coil;
It housed configured to enable the power receiving coil and the battery, either of the upper surface and the lower surface, in transmitting power to the power receiving coil from the feeding coil, a shape that can contact with the mounting surface of the charger With a certain housing,
The power receiving coil is configured such that, in the housing, both end portions of the power receiving coil are positioned near the upper surface and the lower surface of the housing, and the axial direction of the power receiving coil is aligned with the axial direction of the power feeding coil. The power receiving unit is located in The power receiving unit according to claim 1,
It further comprises a magnetic body disposed inside the power receiving coil,
The magnetic body is a power receiving unit in which a storage space for storing a battery is formed. The power receiving unit according to claim 2,
The magnetic body is formed in a tubular shape,
The storage space is a power receiving unit that is a space surrounded by an inner peripheral surface of the magnetic body. The power receiving unit according to claim 2,
An inner space is formed in the magnetic body,
The storage space is a power receiving unit configured by an internal space of the magnetic body. In the power receiving unit according to any one of claims 1 to 4,
The power receiving unit, wherein the power receiving coil is a solenoid coil. The power receiving unit according to any one of claims 1 to 5,
A charging system comprising: a power supply unit having the power supply coil.   An electric device comprising the power receiving unit according to claim 1.

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